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comm.Parameters.Add(param); // execute the stored procedure; an error will be thrown by the // database if the department has related categories, in which case // it is not deleted int result = -1; try { result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); } // Add a new department public static bool AddDepartment(string name, string description) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogAddDepartment"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentName"; param.Value = name; param.DbType = DbType.String; param.Size = 50; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@DepartmentDescription"; param.Value = description; param.DbType = DbType.String; param.Size = 1000; comm.Parameters.Add(param); // result will represent the number of changed rows int result = -1;

Now that we ve completed the IWorksheet<> and IWorksheetBase interfaces, we can define the workbook interface. The workbook interface will not be a .NET generics type, since a workbook will contain multiple worksheet types. However, as you will see, we can optimize this interface to make it easier to use the workbook. For the moment, let s consider the plain-vanilla IWorkbook interface with no .NET generics types, which is defined as follows: ... using Devspace.Trader.Common; public interface IWorkbook : IDebug { IWorksheetBase this[string identifier] { get; set; } string Identifier { get; } } The IWorkbook interface defines one property, Identifier, and an indexer, this. Any class that implements IWorkbook is expected to contain multiple references to IWorksheet<> instances. How those references are managed is not the responsibility of the IWorkbook interface, but of the IWorkbook interface implementation.

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try { // execute the stored procedure result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); } 4. Now we continue by implementing AdminDepartments.aspx. Start by opening the file in Source View. 5. In the first placeholder, display the name of the page: <asp:Content ID="Content1" ContentPlaceHolderID="titlePlaceHolder" runat="Server"> <span class="AdminTitle"> BalloonShop Admin <br /> Departments </span> </asp:Content> 6. Let s now deal with the second placeholder. Switch to Design View. From the toolbox, add one Label control and a GridView control, with the properties listed in Table 11-1, to the second placeholder.

Although Excel still creates the data table, you may not get the results that you may have expected. To re-create the data table, follow the instructions in the Clearing Data Tables section earlier in this chapter.

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Note The IWorkbook interface does not provide a Clear() method to reset the workbook and delete all of the referenced worksheets. It would seem logical to have a Clear() method, but in a garbage-collected environment, that s completely unnecessary. If you don t want to use a workbook anymore, just don t reference it, and the garbage collector will take care of the rest. Think of it as having the option of serving dinner to your guests on real plates or paper plates. Real plates might seem better, but they break and you need to wash them. Paper plates are used once and thrown away. Of course, with paper plates you have recycling issues that you don t have in .NET, because the memory is recycled for you.

7. Set the DataKeyNames property of the grid to DepartmentID and set its Width property to 100%.

The property Identifier is used as a way to identify the workbook to which the instance is referring The identifier might be a path or filename and is completely dependent on the implementation of IWorkbook The indexer is the primary way of getting and retrieving worksheets, where each worksheet is referenced using a string identifier The identifier does not need to be a string it could have been a custom type, enumeration, or interface that is implemented Using a string keeps things simple, but there are maintenance issues Let s say all workbooks have a configuration worksheet So for most of the code, the string identifier "configuration" is used However, a new programmer decides to use "Configuration" (with a capital C) This slight change will cause problems because "configuration" is meant to have a lowercase c.

8. Switch to Source View and add the controls that will allow new departments to be added, just after the grid: <asp:Content ID="Content2" ContentPlaceHolderID="adminPlaceHolder" runat= "Server"> <p> <asp:Label ID="statusLabel" runat="server" Text=""></asp:Label> </p> <asp:GridView ID="grid" runat="server" DataKeyNames="DepartmentID" Width="100%"> </asp:GridView> <p>Create a new department:</p> <p>Name:</p> <asp:TextBox ID="newName" runat="server" Width="400px" /> <p>Description:</p> <asp:TextBox ID="newDescription" runat="server" Width="400px" Height ="70px" TextMode="MultiLine" /> <p><asp:Button ID="createDepartment" Text="Create Department" runat ="server" /></p> </asp:Content> Now your page should look like Figure 11-14.

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